Worked on the woowacourse-teams/2025-Todok-Todok repository, focusing on codebase hygiene, feature rollback, and backend refactoring to streamline development and reduce technical debt. Applied Kotlin and Java to manage Android Studio configuration, removing unused templates and OS artifacts while updating gitignore files for improved repository cleanliness. Executed a controlled rollback of the UT discussion room feature, ensuring system stability and alignment with evolving product priorities. Additionally, contributed to the androidx/androidx repository by correcting documentation typos in KDoc, enhancing API clarity. These efforts improved onboarding efficiency, reduced CI noise, and supported maintainable, well-documented code for future contributors.